Keep in mind the last time she was here she was also;

1: 18 years old
2: an old-walker with unending youth

The women she is now is a reasonably aged 40 something year old woman. No one is going to recognize her even if anyone IS alive to do so.

And also even if they did recognize her, I doubt anyone on this plane would care much? How many people here are gonna have a chance to talk to someone who would know she went to school here, know she's currently faking the dead, and would know that Liliana was present here recently?